CVE-2025-63830: CKFinder 1.4.3 is vulnerable to Cross Site Scripting (XSS) in the File Upload function

Routine

MEDIUM 6.1DOWNGRADE

CVE-2025-63830 is a medium-severity flaw (CVSS 6.1) affecting ckfinder. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CKFinder 1.4.3 is vulnerable to Cross Site Scripting (XSS) in the File Upload function. An attacker can upload a crafted SVG containing active content.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 82%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-11-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: cksource

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-14 18:15 UTCPublished CVE record published
2026-06-17 09:53 UTCUpdated Record last modified

cksource ckfinder DOWNGRADE

Affected: 1.4.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4.3

1. Check installed version

apt-cache policy ckfinder || rpm -q ckfinder || ckfinder --version

2. No fixed release: DOWNGRADE to a release before 1.4.3 (Debian / Ubuntu)

apt-cache madison ckfinder sudo apt install ckfinder=<VERSION_BEFORE_1.4.3> sudo apt-mark hold ckfinder

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ckfinder sudo dnf downgrade ckfinder-<VERSION_BEFORE_1.4.3> sudo dnf versionlock add ckfinder

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-63830?

ckfinder: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-63830 being exploited?

CVE-2025-63830 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-63830 affect?

CVE-2025-63830 affects ckfinder. Severity is medium (CVSS 6.1). CKFinder 1.4.3 is vulnerable to Cross Site Scripting (XSS) in the File Upload function. An attacker can upload a crafted SVG containing active content.

How urgent is CVE-2025-63830?

Priority 31/100. Public exploit reference

Related CVEs

CVE-2016-20023 MEDIUM 5.0 UPGRADE In CKSource CKFinder before 2.5.0.1 for ASP.NET, authenticated users could download any file from the server i

References

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